test: remove poetry references from tox

tox.ini

@@ -4,10 +4,12 @@ isolated_build = true
 skip_missing_interpreters = true
 
 [testenv]
-whitelist_externals = poetry
 commands =
-    poetry install
-    poetry run pytest -v --cache-clear --cov="{toxinidir}" --cov-config="{toxinidir}/pyproject.toml" --cov-report term-missing --basetemp="{envtmpdir}" {posargs} --disable-pytest-warnings
+    pytest -v --cache-clear --cov="{toxinidir}" --cov-config="{toxinidir}/pyproject.toml" --cov-report term-missing --basetemp="{envtmpdir}" {posargs} --disable-pytest-warnings
+deps =
+    pytest
+    pytest-cov
+    pytest-mock
 
 [testenv:codecov]
 passenv = CODECOV_TOKEN
@@ -20,8 +22,9 @@ skip_install = true
 
 [testenv:lint]
 commands =
-    poetry install
-    poetry run pre-commit run -a
+    pre-commit run -a
+deps =
+    pre-commit
 
 [testenv:release]
 passenv = HOME